JPH0684567B2 - Rayon yarn manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing rayon bundled yarn.

More specifically, the present invention relates to a method for efficiently producing a bundled yarn having good performance in producing a rayon yarn by a process including spinning, scouring, drying and winding.

(Prior Art) Conventionally, in order to manufacture a bundled yarn in a rayon manufacturing process, a method of using a twisting machine in a yarn winding process has been widely used. Since the twisting machine requires a high-speed rotating spindle,
The energy cost of the spindle rotation is high, the failure rate is large, and the maintenance cost is high. Especially, when the large package is used, this defect becomes large, which also hinders the large package.

Furthermore, there is a limit to the binding property of rayon yarn by a twisting machine, and for example, in the field where high focusing property is required such as the use of warp of a woven fabric, after gluing the yarn again in the post-processing step, I had to use it.

Although it was a twisting machine with such drawbacks, there is still no other excellent method, and the Centle type centrifugal winder is used as the twisting machine in the batch process, and the ring twister is used as the twisting machine in the continuous process. Things to do are widely practiced.

In addition, a method of raising the sizing property by causing single yarn adhesion in the process is implemented in cupraammonium rayon, but since the sizing property of the yarn varies and it is unstable, it has a specific post-processing technique. It was inevitable to supply only to processors, and the single yarn adhesion by this method could not be applied to the production of viscose rayon, and the method had little versatility.

Also, a method of bundling the yarn with a sizing agent has been proposed for a long time, that is, a so-called Hoffman type continuous spinning method in which the yarn is run in a straight line, and it is found, for example, in Japanese Patent Publication No. 35-9804. These methods have the drawback that the sizing agent is adhered to and solidified on the yarn-contacting parts such as the yarn path to generate fluff and cutting yarn. Furthermore, there are many focusing spots, and in order to raise the lower limit of focusing,
If the average value is increased, the yarn becomes harder, and the yarn cross section becomes flat, and the final product woven fabric has many defects such as the result of this flattened yarn cross section as a deficiency of the surface quality of the woven fabric. However, the method for producing a bundled yarn using a sizing agent is not a general-purpose technique.

A proposal to change the composition of the sizing agent in order to solve the above-mentioned defects caused by the sizing agent is also made in Japanese Patent Publication No. 48117/48. These methods certainly improve the flexibility of the yarn to which the sizing agent is added, but the generation of fluff and cutting yarn cannot be essentially suppressed, and defects associated with the sizing agent cannot be completely corrected.
Further, the special sizing agent has new defects such as high cost and quality variation for small-volume production, and these proposed techniques have not yet been industrialized.

The inventors of the present invention have arrived at the present invention as a result of intensive research to solve the above defects.

(Object of the invention) It is an object of the present invention to provide a method for efficiently producing an excellent rayon-bound yarn having less unevenness of a sizing agent in a series of rayon yarn producing steps.

(Structure of the invention) An object of the present invention is to provide a yarn having a water content of 50% by weight or more and having a water content in the range of not more than the water content in the primary swelling degree in the course of a drying step with a film forming ability after drying. It is achieved by a method for producing a rayon yarn, which comprises applying a sizing agent liquid containing the polymer compound, having the sizing agent liquid dried using a counter roll, and winding the yarn.

(Specific description of constitution) The rayon yarn manufacturing method is composed of spinning, scouring, and drying steps. There are two methods: a batch process for winding in the middle and a continuous spinning process for winding after drying. However, in any case, the method of the present invention will be described in detail below with respect to a method for efficiently producing an excellent bundled yarn, which is carried out in this drying step.

The sizing agent liquid is a liquid containing a polymer compound capable of forming a film after drying, and is, for example, an aqueous solution of a compound such as polyvinyl alcohol or polyvinyl acetate, or an emulsion such as a polyolefin compound. Of course, a liquid having a hydroxyl group can be used as the medium, but it is preferable to use water as the medium in the method of the present invention in terms of cost and production control.

By applying this sizing agent liquid to the yarn and then drying it, a film of the sizing agent is formed between the surface of the yarn and the single yarn constituting the yarn, and the yarn has a sizing property. , It is necessary to use this sizing agent liquid.

There is a roll method (for example, Japanese Patent Publication No. 35-9804) that has been proposed for a long time to apply the sizing agent liquid to the yarn, but in this method, the amount of the sizing agent liquid applied to the yarn is in the yarn length direction. Also, it is not suitable because unevenness is generated in the direction of the groin and a compact sizing agent application device is required in the method of the present invention. Therefore, it is advisable to apply the sizing agent liquid to the yarn using a metering nozzle that is free of these defects.

The quantitative nozzle referred to here is a nozzle that discharges the sizing agent liquid to the running yarn, and one end thereof is a nozzle that is connected to a pipe that quantitatively sends the sizing agent liquid by a metering pump.

The paired roll is a roll provided with a plurality of rolls whose axes are inclined to each other, and is a roll represented by a Nelson type roll which is used by combining two rolls.

In the method of the present invention in which a pair of rolls is used for drying, at least one of the plurality of rolls needs to be a heating roll.

In the drying of the yarn using this pair of rolls, when the sizing agent liquid is applied to the yarn and then dried, it has a remarkable effect of applying the sizing agent with less unevenness, and the defect of the conventionally proposed method for producing a sizing yarn Since most of the problems can be solved, it is necessary to dry the yarn using a twin roll.

In the drying using a pair of rolls, the yarn runs in a spiral shape in the space between the roll surface and the roll tangent line, and the yarn substantially runs in the roll axial direction, and the running route is regulated by a resistor such as a yarn path. Instead, the yarn can run in a helix-like manner, increasing the yarn density on the roll surface. Therefore, the anti-roll drying is the most suitable method for drying the yarn to which the sizing agent liquid has been applied, since there is no resistance such as a yarn path to the yarn. In this case, although the phenomenon in which the sizing agent liquid adheres to the surface of the roll and solidifies occurs, the adhered solidified substance on the surface of the roll that rotates at the same speed as the yarn acts as resistance to the running yarn and generates cutting yarn and fluff. Probability of doing is low. In particular, as compared with the Hoffman type drying, which has been proposed in the past, that is, a system in which a yarn is linearly passed through a hot air dryer, the generation of fluff and cutting yarn can be greatly suppressed.

Further, the use of anti-roll drying in the method of the present invention focuses on the phenomenon of rolling of the yarn on the surface of the drying roll during anti-roll drying and the phenomenon of the yarn being pressed against the surface of the drying roll. Is to utilize. That is, in the anti-roll drying, the yarn travels on the surface of the roll at the same speed as the circumferential bundle of the roll, but when observed in detail, the yarn rotates at right angles to the traveling direction of the yarn. It is well known that the yarn shrinks when it is dried, and the force of pressing the yarn against the roll surface acts.

According to the method of the present invention utilizing these two phenomena, excellent bundled yarn can be obtained. That is, the bundled yarn has a circular cross-section and does not cause any defects, and the length that allows a small amount of a sizing agent to be attached to the yarn can improve the yarn sizing ability.

The cross-sectional deformation of the yarn can be determined by weaving the bundled yarn obtained by the method of the present invention into a woven fabric.

Although the woven fabric obtained by the method of the present invention is a uniform woven fabric having excellent surface quality, it is a conventional parallel roll having a plurality of tunnel-type dry rolls or axes having mutually parallel rolls. The surface of the woven fabric made of the bundled yarns obtained by the dry drying is so-called chika fabric. The reason why the yarn is a fluffy fabric is that the cross section of the yarn is deformed and flattened.

In the method of the present invention, the yarn after the sizing agent liquid is applied is dried by a roll-drying method, so that the yarn to which the sizing agent liquid is applied is pressed against the surface of the drying roll as described above. While being rolled, the surface of the drying roll is rolled and dried. For this reason, the cross section of the yarn is rounded during the drying process, and an excellent bundled yarn can be obtained.

Also, even if a small amount of sizing agent is attached to the yarn, high sizing property can be obtained, because the attached sizing agent liquid spreads around the yarn as a thin film as the yarn rolls on the surface of the drying roll. This is because it effectively adheres to the yarn surface, and thus the focusing property is improved as compared with other methods.

In the method of the present invention, when the sizing agent liquid is applied to the yarn with the metering nozzle and then dried and wound using the pair roll, the timing of applying the sizing agent liquid to the yarn must be appropriately determined.

That is, it is necessary to apply the sizing agent liquid to the yarn having a water content of 50% by weight or more and a water content in the range of not more than the primary swelling degree. The moisture content of the thread is
If it is 20% by weight or more and not more than the water content at the primary swelling degree, the focusing effect of the present invention can be substantially exhibited. However, considering the stability during mass production, it is necessary to set the moisture content of the yarn to 50% by weight as described above.

Usually, the rayon yarn spun according to the continuous spinning method has a water content of 400% to 600% at the stage of spinning and scouring. This moisture content is reduced by passing through a drying process, and finally it is dried and then wound into rolled cheese or the like. Therefore, the application timing of the sizing agent liquid is determined by sampling the yarn in the course of the drying process, measuring the moisture content of the yarn, and confirming that the moisture content is within the range.

When the water content of the yarn is equal to or higher than the primary swelling degree, the sizing agent liquid applied to the yarn oozes out from the yarn and causes two obstacles. First, a part of the sizing agent liquid oozing out from the yarn adheres to the drying roll, and a solidified product of the sizing agent liquid grows on the surface of the drying roll when it is operated for a long time. When the running yarn separates from the surface of the drying roll, the product is caught, and fluff and cutting yarn are generated. Secondly, a part of the squeezing agent liquid that has exuded is shaken off and dropped from the drying roll, resulting in loss of the sizing agent used, and also, if a recovery step is not provided, it will lead to troubles such as wastewater pollution.

When the moisture content of the yarn is not more than the primary swelling degree, the sizing agent liquid applied to the yarn is retained on the surface of the yarn and between the single yarns constituting the yarn,
Almost no bleeding from the yarn occurs. Therefore, the generation of fluff and cutting yarn due to the application of the sizing agent liquid to the yarn does not occur at all. In addition, the sizing agent in the sizing agent liquid applied to the yarn adheres to the yarn in a substantially quantitative manner, and no loss occurs.

Here, the primary swelling degree of rayon yarn is swelling of the yarn after spinning and scouring, and the value of the swelling degree varies depending on the manufacturing process. In particular, there is a difference between the continuous spinning and the batch process, but in both cases, the sizing agent liquid must be applied to the yarn at the primary swelling degree of the yarn or less.

The primary degree of swelling of the yarn is calculated by the following formula after spinning and refining the yarn, centrifuge to dehydrate the yarn at 3000 rpm, weigh it (W ₁ ), dry it and weigh it again (W ₂ ). .

By the way, the primary swelling degree of viscose rayon yarn after spinning and scouring is 180% to 150% in the batch process and 220% to 200% in the continuous spinning process.

When the water content of the yarn is 20% or less and the sizing agent liquid is applied, only a sizing yarn having a low sizing property is obtained, which is not preferable. Furthermore, when the moisture content of rayon yarn is less than 20%, the drying mechanism becomes a complete reduction rate drying type, it takes time to dry a small amount of moisture, and in terms of energy efficiency, the yarn has a moisture content of less than 20%. It is disadvantageous to apply the sizing agent solution.

According to the method of the present invention, generation of fluff and cutting yarn is small, an excellent binding yarn is obtained, and loss of the sizing agent does not occur.

Moreover, since a non-twisting winding machine can be used for winding, there is no trouble that occurs when using a conventional twisting machine.

Of course, the oil agent may be added to the yarn immediately before the yarn is wound up, if necessary.

Further, the effect of the method of the present invention is that, in addition to the points described above, a wide sizing property can be freely imparted to the yarn according to the application. This can be achieved by adjusting the concentration of the sizing agent liquid applied to the yarn.

For wefts and twists of textiles, the amount of sizing agent attached to the yarn should be 0.2% to 0.8%, and for warp of textiles, the amount of sizing agent attached to the yarn should be 1.0% to 3.5%. According to the present invention, the bundled yarn in this range can be easily manufactured without any trouble. In particular, the warp of the woven fabric is required to have a high level of sizing property because the yarn is subjected to strong friction in the weaving process, but the method of the present invention provides a sizing yarn that can be used as the warp of the woven fabric in the production process of rayon for the first time. It was decided to be.

Further, the method of the present invention can be used not only for producing viscose rayon but also for producing cupra ammonium rayon,
The range of utilization is extremely wide.

The method of the present invention is applied to the production of rayon yarn, and can be applied to either a continuous spinning method or a batch type spinning method. Hereinafter, embodiments of the present invention will be described with reference to the illustrated example.

As a continuous spinning method, there is a method using a pair of rolls, that is, a Nelson type continuous spinning method. An embodiment in which the method of the present invention is applied to this Nelson system is shown in FIGS. 1a and 1b. FIG. 1a is a side view for explaining the Nelson method, and FIG. 1b is a front view seen from the spinning section side in FIG. 1a and is shown in a simplified manner. Spinning solution tube 1, spinneret 2
The yarn 4 extruded through the coagulation bath 3 is guided to the rotating counter rolls 5 and 6. The pair of rolls 5 and 6 are installed with their axes inclined and rotated as shown by the arrow in FIG. 1b,
The yarn runs spirally on the roll. Reference numeral 7 denotes a refining section, through which the refining liquid is sprinkled from a sprinkling nozzle 8. Reference numeral 9 represents a liquid supply pipe for the scouring liquid. Denoted by 10 is a liquid removing section, in which the yarn is removed by being pressed against a roll. Reference numeral 11 denotes a drying unit, which is configured so that heated steam is introduced, though not shown. Reference numeral 12 is a fixed quantity nozzle for the sizing agent solution, and 13 is a liquid delivery tube for the sizing agent solution. Although not shown, this liquid sending pipe is connected to a metering pump. Nozzle for fixed amount of sizing agent liquid
In the drying section 11, a portion having a water content of 50% by weight or more in the drying section 11 and having a water content within the range of not more than the water content in the primary swelling degree is found by measurement and set at that position. Further, as shown in FIG. 1b, the discharge liquid 14 from the nozzle is installed so as to contact the yarn. Then, the yarn that has been bundled and bundled with the sizing agent liquid is wound on the cheese 16 by the winder 15. 17 shows a thread guide.

Figure 2 shows the Hoffmann continuous spinning method (Chemical Fiber Handbook P-505,
It is an explanatory view showing an embodiment which carries out in combination with a pair roll and (issued on August 20, 1978, Maruzen KK). In the figure,
1,2,3,4,5,6,11,12,13,15,16,17 follow the description of Figure 1a. The spun yarn 4 travels linearly and is guided to the scouring bath 18 where it is subjected to the scouring action of the bath liquid. Subsequently, it is introduced into a tunnel type dryer 19 and dried to a moisture content of about 150%, and then introduced into a drying section 11 comprising rolls 5 and 6. In the drying section, the sizing agent liquid is applied, dried and wound.

FIG. 3 is an explanatory view showing a mode in which the present invention is carried out by a spool spinning method. In the figure 1,2,3,4,5,6,11,12,13,15,16,1
7 follows the description of FIG. 1a. This method spun yarn 4
Is immediately formed on the spool 20 like a cake.
Next, this spool 20 is scoured by a scouring liquid. 21 is a refining liquid injection nozzle. Next, this spool 20 is dehydrated by a centrifugal dehydrator 22. After the spin-drying, the yarn drawn from the spool is guided to the drying section 11 including the pair of rolls 5 and 6. The sizing agent liquid is applied in the drying section, dried and wound.

In addition to the above-described various embodiments, the method of the present invention is a cool jean type roll composed of a plurality of rolls (see Chemical Fiber Handbook P-444, issued August 20, 1978, Maruzen KK).
Alternatively, a drum type roll (Japanese Patent Publication No. 53-46927) can be used. The Courjean roll is similar to the anti-roll system, but the anti-roll system is composed of two rolls, whereas the Courjean roll is composed of eight inclined rolls. . Then, the yarn spirally rotates on this roll, and scouring and drying are performed in the process in the same manner as in the anti-roll type. Therefore, if the present invention is applied, the sizing agent liquid can be applied to the yarn during the drying process. A drum-type roll is a scouring drum and a roll formed by arranging the shaft above the drum and arranging them side by side in a stepped manner, winding the spun yarn on the roll, and rotating and running on the roll. Similarly, scouring and drying are performed in the process. Therefore, if the present invention is applied, the sizing agent liquid can be applied to the yarn during the drying process.

(Effect of the invention) Since the method for producing a rayon yarn according to the present invention is configured as described above, by using the method of the present invention, an excellent rayon-focused yarn with a small amount of sizing agent-attached spots can be produced in a series of rayon yarn production steps. Can be manufactured efficiently. Since it can be wound in a non-twisted state, it is possible to eliminate troubles that may occur when a conventional twisting machine is used.

(Example) Hereinafter, the present invention will be described more specifically by way of examples.

Examples 1 and 2 75den / 26 filaments of viscose rayon were produced. On the thread that has been deliquored and entered the drying section, with a metering nozzle,
A sizing agent solution was applied. The sizing agent liquid is 0.7% of polyvinyl alcohol (Gothenol GL-05, Nippon Synthetic Chemical Co., Ltd.)
0.7 ml / min for yarn running at 100 m / min with aqueous solution
Attached in.

In Example 1, continuous roll-to-roll spinning was performed, and a sizing agent solution was added to a portion having a water content of 120% in the middle of the drying step. In Example 2, Hoffman continuous spinning was performed to obtain a moisture content of the yarn. Rate 150
When the percentage reached, the yarn was taken out from the dryer, hung on a pair of rolls, the sizing agent liquid was applied at the entrance, and dried using the pair of rolls. Both Examples 1 and 2 were wound on cheese without twisting.

Comparative Example 1 is different from Example 2 only in that Hoffman drying, that is, hot air drying was performed even after applying the sizing agent liquid to the yarn, and the other conditions were the same as those of Example 2 (Hoffmann continuous spinning). Met.

Comparative Example 2 in which the conventional method is Comparative Example 2 is different from Example 1 in that the sizing agent liquid is not applied and the winding of the yarn is performed by the ring twisting machine.
Another example 1 is different in that it was wound with a twist of 1 turn / m.
The conditions were the same as those for the continuous roll-type spinning.

For Examples 1 and 2 and Comparative Examples 1 and 2, the cutting threads generated during the production were measured. Further, for the yarns obtained in Examples 1 and 2 and Comparative Examples 1 and 2, the measurement of fluff, the cut fluff length was measured as the measurement of the sizing agent property, and Air Jet Loom (manufactured by Tsudakoma, RD
P) and the surface quality of the fabric was visually determined.
In addition, the amount of the sizing agent attached to the yarn was measured, and the sizing of the sizing agent was evaluated.

The results are shown in Table 1.

In Examples 1 and 2, the generation of cutting threads and fluff was no different from that of Comparative Example 2 which is a conventional method, and it can be seen that the method of the present invention does not generate fluff and cutting threads. On the other hand, in Comparative Example 1, fluff,
The number of cutting threads is increasing, and after applying the sizing agent liquid to the threads, it is possible to show an excellent effect by drying with a pair of rolls.
It is clear from the table.

Further, it can be seen that the yarns obtained in Examples 1 and 2 have shorter cut fluff lengths and higher bunching properties than the yarn of Comparative Example 1 in terms of bunching properties.

Further, the surface quality of the obtained woven fabrics was excellent in Examples 1 and 2, but in Comparative Example 1, the occurrence of flicker caused a problem in practical use.

The amount of the sizing agent attached to the yarn was quantitatively attached to the applied sizing agent in Examples 1 and 2, whereas it was smaller than that in Comparative Example 1.

Further, the number of patches with a sizing agent was small in Examples 1 and 2, but remarkable in Comparative Example 1.

Examples 3,4 A 75den / 26 filament of viscose rayon was prepared by twin roll continuous Nelson spinning. The yarn after spinning and scouring was wound up, and the yarn was dehydrated by a centrifugal separator at 3000 rpm and the primary swelling degree was measured and found to be 210%. After that, it was led to a dryer composed of a pair of rolls, but in Example 3,
When the water content of the yarn was 200%, and in the case of Example 4, the water content of the yarn was 50%, the sizing agent solution was applied in the middle of the roll for drying and then dried and wound on cheese without twisting.

The sizing agent liquid is polyvinyl alcohol (Gothenol GL-
05, Nippon Gosei Kagaku Co., Ltd.) 0.7m aqueous solution, 100m / mi
0.3 ml / min was applied to the yarn running at n.

In Comparative Example 3, the sizing agent liquid was applied when the water content of the yarn was 300% (more than the water content at the primary swelling degree), and the other conditions were the same as in Example 3.

In Comparative Example 4, the sizing agent liquid was applied to the yarn when the moisture content of the yarn was 12% (the condition where the moisture content was low), and the other conditions were the same as those of Example 3.

The yarn cutting rate during the production of the yarn was measured, the amount of the sizing agent attached to the obtained yarn was measured, and the sizing agent attachment unevenness was evaluated, and the sizing property was measured by the cutting fluff length, and the fluff was also measured. .

The results are shown in Table 2.

The yarn cutting ratio during manufacture was good in Examples 3 and 4 and Comparative Example 4, but was as high as 5% in Comparative Example 3.

The obtained yarns had high bunching properties in Examples 3 and 4, but Comparative Examples 3 and 4
Was low.

The fluff of the yarn was good in Examples 3 and 4 and Comparative Example 4, but there were many fluffs in Comparative Example 3.

The number of patches with sizing agent was small in Examples 3 and 4, but remarkable in Comparative Examples 3 and 4.

Example 5 A 75den / 26 filament of viscose rayon was prepared. The sizing agent liquid was applied to the yarn that had been drained and entered the drying section with a metering nozzle. The sizing agent liquid is 1.5% of polyvinyl alcohol (Gothenol GL-05, Nippon Synthetic Chemical Co., Ltd.)
An aqueous solution was used. The yarn was subjected to continuous roll-type spinning, a sizing agent liquid was applied to the yarn having a moisture content of 150% in the middle of the drying step, and after drying, it was wound untwisted with a cheese winder. Then, whether or not the obtained yarn has a characteristic that can be used as a warp of a woven fabric, the characteristic was measured and compared with the yarn obtained by the conventional method. The yarn of the conventional method is a yarn of the above-mentioned viscose rayon 75den / 26 filaments, which is produced by continuous spinning with a roll.
It is a yarn obtained by winding the yarn with a ring twisting machine without adding a sizing agent liquid, and putting in a twist of 60 times / m and winding.

The yarn cutting rate during the production was measured, the amount of the sizing agent attached to the yarn was measured, and the cut fluff length was measured as the measurement of the yarn sizing property. Furthermore, whether or not it can withstand the friction of the warp of the fabric
The generation of fluff was measured with a TM tester. The results are shown in Table 3.

As can be seen from Table 3, in Example 5, the yarn cutting rate during manufacture was low. The amount of the sizing agent applied was almost close to the concentration of the applied sizing agent solution.

The characteristic of the yarn is that the length of the cut fluff is much shorter than that of the conventional method and the yarn has a high bundling property. The TM tester also produces less fluff than the conventional method, which indicates that it can withstand the friction during use when used in the warp of a woven fabric. This shows that a usable yarn is obtained.

[Brief description of drawings]

FIG. 1a is a schematic side view of an apparatus for carrying out the method of the present invention by a Nelson type continuous spinning method, and FIG. 1b is a schematic front view of the apparatus shown in FIG. 1a as seen from the spinning section side. Is. Second
FIG. 1 is a schematic side view of an apparatus for carrying out the method of the present invention as another embodiment by a method in which a Hoffman type continuous spinning method and a drying method using a pair of rolls are combined. FIG. 3 is a schematic side view of an apparatus for carrying out the method of the present invention in combination with the spool spinning method and the drying with a pair of rolls. 1 ... Spinning stock solution tube, 2 ... Spinneret, 3 ... Coagulation bath, 4 ... Threads, 5 and 6 ... Pair rolls, 7 ... Scouring section, 8 ... Dispersing nozzle, 9 ... Liquid delivery tube, 10 ... Draining section, 11 ... Drying section, 12 ... Nozzle for fixed amount of sizing agent liquid, 13 ... Liquid supply pipe, 14 ... Discharge liquid, 15 ... Winding machine, 16 ... Cheese, 17 ... Thread guide, 18 ... Scouring bath, 19 ... Tunnel Mold dryer, 20… Spool, 21… Refining liquid injection nozzle, 22… Dehydrator.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeo Katsuyama 6-4100 Asahi-cho, Nobeoka-shi, Miyazaki Asahi Kasei Kogyo Co., Ltd. (56) Reference JP-A-56-49011 (JP, A) JP-A-59- 43110 (JP, A) JP-A-53-49119 (JP, A)

Claims (1)

[Claims] 1. A high molecular compound having a film-forming ability after drying is added to a yarn having a water content of 50% by weight or more and a water content in the range of not more than the water content in the primary swelling degree during the drying step. A method for producing a rayon yarn, which comprises applying a sizing agent solution containing the composition, drying the composition using a counter roll, and winding it.